Electrical and Mechanical Power

answered Apr 14 '16

MNing
1 ●1 ●1 ●1

The dynamic process is caused by the difference between electrical power and mechanical power. If the electrical power and mechanical power are equal, there will no dynamic process.

answered Apr 7 '16

danzg
11 ●1 ●2

updated Apr 8 '16

The difference is due to the convention used in dynamics simulation output (see list of output signals in Table 14-2 in PSS/E V32 Operation Manual). Mechanical power is given in pu on machine MVA base (MBASE) while electrical power is expressed on system MVA base (SYSMVA=100 MVA by default). For example, a 500 MVA machine with 0.8 pu mechanical power (i.e. 0.8x500=400 MW) will have electrical power equal to 4 pu (on 100 MVA basis), if losses are neglected.